Dorymyrmex morenoi

Dorymyrmex morenoi

Dorymyrmex morenoi is a small ant species native to Argentina, belonging to the Dolichoderinae subfamily. Workers are pale in color with a distinctive lighter appearance, this species has a brightness value of 85.3,making it one of the lighter Dorymyrmex species ^[1]. The genus gets its common name 'pyramid ants' from the characteristic cone-shaped mounds they build at nest entrances. This species has notably enlarged eyes (relative eye size 0.0344), which is an adaptation suggesting activity during low-light conditions such as dawn, dusk, or nighttime ^[1]. Workers are small and slender, typical of the genus.

Quick Summary

• Difficulty: Easy
• Origin & Habitat: Native to Argentina in the Neotropical region. Found in the type locality of Ampachango, Catamarca ^[2]. They nest in the ground, typically in open areas where they construct their characteristic pyramid-shaped mound entrances.
• Colony Type: Colony structure is unconfirmed. Most Dorymyrmex species are monogyne (single queen colonies), but specific data for D. morenoi is lacking.
• Size & Growth:
  • Queen: Estimated 6-8mm based on genus typical sizes, not directly measured for this species
  • Worker: Estimated 3-5mm based on genus typical sizes, not directly measured for this species
  • Colony: Unknown for this species, but Dorymyrmex colonies typically reach several hundred to a few thousand workers
  • Growth: Moderate, estimated based on genus patterns
  • Development: Estimated 6-8 weeks at optimal temperature based on related Dolichoderinae species (Direct development data unavailable for this species, estimates based on genus-level patterns)
• Antkeeping:
  • Temperature: Keep at room temperature, roughly 18-24°C. Being from Argentina, they can tolerate a range of conditions. Provide a gentle heat gradient if your room is cool.
  • Humidity: Moderate humidity is suitable. Keep the nest substrate slightly moist but not waterlogged. These ants are from temperate regions and handle average household humidity well.
  • Diapause: Likely requires a winter rest period (diapause) of 2-3 months at cooler temperatures (10-15°C), typical for Argentine species. Reduce feeding and keep them in a cool location during winter.
  • Nesting: Standard test tube setups work well for founding colonies. For established colonies, a Y-tong or plaster nest with narrow chambers suits their small size. They prefer dark, enclosed spaces.
• Behavior: Generally calm and non-aggressive. Workers are small but active foragers. Their enlarged eyes suggest they may be more active during cooler parts of the day or in low-light conditions. They likely forage for honeydew and small insects. Escape risk is moderate, their small size means you should use fine mesh and tight-fitting barriers.
• Common Issues: small size makes escape likely without proper barriers, winter diapause is often misunderstood by beginners and colonies can be lost if not provided proper cooling period, limited specific care information means keepers must rely on genus-level knowledge, wild-caught colonies may have parasites or diseases that cause problems in captivity

Housing and Nest Setup

Dorymyrmex morenoi can be kept in standard test tube setups for founding colonies. Use a test tube with a water reservoir plugged with cotton, this provides humidity without flooding. For established colonies, a Y-tong (acrylic) nest or plaster nest works well. The chambers should be appropriately sized for their small worker size (3-5mm). These ants prefer dark conditions, so cover the nest with a red film or keep it in a dark area. A small outworld for foraging allows you to observe their activity and offer food.

Feeding and Diet

Like other Dorymyrmex species, these ants likely have a mixed diet. They probably collect honeydew from aphids and scale insects in the wild, so offering sugar water or honey water is recommended. They also likely accept small protein sources like fruit flies, small crickets, or mealworm pieces. Feed protein 2-3 times per week and keep a sugar source available at all times. Remove uneaten food promptly to prevent mold.

Temperature and Seasonal Care

Being from Argentina, this species can tolerate a range of temperatures. Room temperature (18-24°C) is suitable for active colonies. During the winter months (roughly November-February in the Southern Hemisphere), they likely enter a diapause period. In captivity, you can simulate this by moving the colony to a cool location (10-15°C) for 2-3 months. Reduce feeding during this period as their metabolism slows. Do not feed them during diapause as uneaten food will mold.

Behavior and Activity Patterns

The notably enlarged eyes of Dorymyrmex morenoi (relative eye size 0.0344) suggest this species may be more active during dawn, dusk, or even nighttime compared to typical diurnal ants ^[1]. This is supported by the pale coloration (brightness value 85.3), which is another indicator of low-light activity in ants ^[1]. Workers are likely active foragers that build the characteristic pyramid-shaped mounds at nest entrances. They are generally not aggressive and rarely sting, their small size means any sting would be minimal.

Frequently Asked Questions

References